Alert archive / Florida / Mesoscale Discussions in 2007

Mesoscale Discussion 508

April 15, 20074 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2007, 3:42 PM EDT for 4 counties in Florida. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Apr 15, 2007, 3:42 PM EDT (19:42 UTC)
Expired: Apr 15, 2007, 5:15 PM EDT
In force: 93 min
Issued by: the Storm Prediction Center

Counties Broward County, FL, Miami-Dade County, FL, Monroe County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 54 km from the middle of the area, began a volume at 19:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 7.7 hours before the alert went out and 295 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1470 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 331 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 12.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 14, 8:09 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 12 more	2 hr
Apr 14, 11:45 PM EDT	Tornado Watch	SPC	Calhoun, Franklin, Gadsden, Gulf, Jackson, Jefferson and 4 more	6 hr
Apr 15, 2:27 AM EDT	Mesoscale Discussion	SPC	Alachua, Citrus, Dixie, Franklin, Gilchrist, Hernando and 4 more	2 hr
Apr 15, 9:31 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Flagler and 22 more	59 min
Apr 15, 9:45 AM EDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 18 more	7 hr
Apr 15, 1:03 PM EDT	Mesoscale Discussion	SPC	Broward, Collier, Glades, Hendry, Highlands, Indian River and 7 more	117 min

Nearby

Mesoscale Discussions in Florida, 2007 Every mesoscale discussion in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.